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Among all common supernatural races, if vampires claimed to be second-best in regeneration, no one else would dare claim first—not even the famously resilient werewolves.
After all, while werewolves boasted extreme regenerative prowess and stamina, they lacked sufficient endurance methods. A werewolf, beaten halfway to death, couldn't just grab a random target, sink in their fangs, and instantly rebound to full health for round two. Vampires, on the other hand, thrived exactly by doing just that—allowing them a near-limitless combat potential.
And right now, as the Fourth Progenitor, Nagisa was the perfect proof.
Once a fragile human girl, upon awakening her Progenitor bloodline, Nagisa had skyrocketed in every physical attribute—strength, agility, magical power, and especially endurance.
If previously a mere 800-meter run in PE class was enough to make her half-dead, now, sprinting flat-out from one end of Itogami Island to the other wouldn't even cost her a minute.
This terrifying physical prowess also meant her first intimate experience was a stunning success, easily surpassing Irina—who was a trained exorcist—let alone utterly dominating Rias, whose fighting style was purely magic-based and lacked stamina.
In short: They went overboard…
From after lunch until the sky turned dark, the room's sounds finally quieted down only once lights flickered to life in the surrounding apartment buildings across the street.
Inside Nagisa's apartment, the air still felt thick with the heavy scent of passion, and every surface—bed, floor, even window curtains—was littered with unmistakable evidence of their afternoon-long "battle."
However, neither Nagisa nor Bokue remained in the bedroom. The previously closed door had swung open, and the trail of "battlefield evidence" stretched clearly across the living room, to the sofa, the coffee table, even over to the kitchen countertops.
Yet in the end, all these marks pointed toward one final place—the bathroom.
Inside the familiar cramped space, the two sat cuddled together in the tub once more.
Naturally, the bathwater had been drained and replaced. After the first round, the water was… certainly no longer usable. Fresh water had replaced it, although even this new batch was quickly losing heat as time passed.
"Mmm… Big Bro, I love you…"
Clear water gently rose to Nagisa's chest as she nestled against Bokue, slender arms wrapped firmly around his waist, eyes closed contentedly as she rested her burning cheek against his chest.
This embrace was Nagisa's favorite, listening to Bokue's steady heartbeat and drawing comfort and security from his presence.
"After we're done washing up, let's have dinner together, okay?" she murmured softly. "There's already prepared ingredients in the fridge, so it won't take long."
"Alright."
Bokue quickly agreed.
Considering human-world time synced roughly with the Underworld, Rias and the others had probably already started dinner by now. After he finished here, he'd still have to return home to Tokyo first to pick up the game console Kuroka requested. By the time he returned to the Gremory castle, they'd likely have finished eating already.
"But are you sure you're feeling alright? We've been at it so long today—can you really cook dinner like this?" he asked with genuine concern.
"Eh? Big Bro, are you actually worried about me?"
Nagisa blinked up at him, her eyes sparkling playfully.
"Honestly, there's really no need to worry. I'm not tired at all, actually. No discomfort or anything—but I am kind of hungry…"
When she mentioned being hungry, her cheeks inevitably flushed brighter red. After their lengthy afternoon marathon, Nagisa felt undeniably "full," and, frankly, quite a bit had sadly gone to waste due to her limits.
But still, sustenance was necessary. Pure "liquids" weren't exactly nutritious meals; proper food was essential for healthy growth—height growth, she mentally corrected herself, blushing again.
"Oh! When we eat dinner, let's invite Yukina-chan over too."
Nagisa suddenly suggested.
"Originally, I made enough for the three of us at lunchtime, but you didn't show up yesterday noon, Big Bro, so we had leftovers. Then Yukina-chan treated me to dinner yesterday evening, meaning I had to store everything else in the fridge. We barely finished the leftovers yesterday—if we don't eat the remaining fresh ingredients today, they'll go bad."
"So later, Big Bro, could you invite Yukina-chan over from next door? Let's have dinner together, the three of us."
It was an unassailable logic, leaving Bokue with no room to refuse.
"Alright, I'll invite her after we finish bathing," he nodded. "But before that, we'll really need to clean up the apartment."
They absolutely had to clean. And ventilate the apartment for at least twenty minutes. After the "battle" they'd fought for the entire afternoon, the sheer number of traces would probably make Yukina reach straight for Schneewalzer the instant she walked through the door.
"Then it's decided~ While you're cleaning, I'll prepare dinner!"
Nagisa was clearly delighted by this neatly divided arrangement. Smiling, she tilted her head adorably—but even as she spoke, her delicate waist unconsciously moved ever so slightly in his lap.
"But… before that, Big Bro, could you maybe…?"
"Again?" Bokue finished for her knowingly.
Half a day's intense "team exercise" had made Bokue intimately familiar with Nagisa's subtle cues. Hearing his blunt reply, Nagisa averted her gaze shyly and gave a tiny nod, blushing even harder.
"Because… it just feels so good when you hold me tight…"
Well, there was nothing for it. She was still just a kid, after all. Sure, being in junior high sounded grown-up—but in reality, she'd barely graduated from elementary school. Having found something she genuinely enjoyed, restraint wasn't exactly in her vocabulary.
Bokue wasted no words, simply leaning down and capturing her lips once again.
He'd intended once...
They ended up doing it five more times.
Afterward, they continued three more times until the water became dirty again, forcing them to quickly rinse under the shower instead. Yet while drying each other off, the mood took over again, and another two rounds soon followed.
All told, by the time Bokue finished dinner with Nagisa and Yukina and left Nagisa's apartment, it was already nearly eight in the evening.
"Well… I'd planned to visit Asagi tonight too, but forget it, I'll check in tomorrow instead," Bokue murmured as the scene shifted to Tokyo. He glanced at his phone inside his apartment building's elevator, letting out a sigh of slight exasperation.
Honestly, should he gently warn Nagisa to ease up a bit in the future? While he had no issue personally, she was still just a junior high student, despite her newfound status as a vampire progenitor. Spending entire days indulging in this sort of thing... it felt a bit problematic.
With that in mind, Bokue stepped off the elevator as it dinged to signal his arrival. Pulling out his keys, he reached the door to his Tokyo apartment—and abruptly froze.
Because from inside his apartment, clearly audible voices floated out—two unfamiliar female voices he didn't recognize at all.
"Mio-sama, let's just stay here for tonight. There are clothes in your size here already, and judging from the amount missing from the wardrobe, the owner of this place probably won't return for a while anyway. We can figure out more permanent accommodations later."
"Hmm… you're right, Maria."
Bokue stood frozen, utterly bewildered.
What the…?
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